A solid performer that in my opinion is worth the premium over other 50mm
I use both FX and DX format cameras (Nikon D200 and D700). The lens performs excellent on both, but I prefer the native focal length of 50mm on full frame. Sharpness is great even wide open, but be reminded that your depth of field is very shallow at f/1.4 so be very careful of your focusing. No noticeable light falloff in normal shooting situations. The lens is a beast though, a bit heavy for a 50mm not for everyone; easily as big as the 85mm f/1.4. Built like a tank. Only downside for me is the 77mm filters. That just requires a little more saving for the filters - you do want to protect that beautiful front element.